Method of forming integrally-joined sheets of dissimilar metals



3 w. H. KLocKE 5 METHOD OF FORMING INTEGRALLY JOINED SHEETS OF DISSIMILA Filed Sept. 6. 1927 R METALS INVENTOR W/Y/Ia) hf K loo/(e 3 I i V;

' ATTO EYJ,

WILLIAM H. KLOCKE,

Patented Aug. 5, 1939 UNETED STATES PATEN'F OFFHCE OF WOODHAVEN, NEW YORK, ASSIGNOR TO THE CLEVELAND GRAPHITE BRONZE COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO METHOD OF FORMING INTEGRALLY-JOINED SHEETS OF .IDISSIMILAR METALS Application filed September 6, 1927. Serial No. 217,659.

The present invention relating, as indicated, to a method for forming integrally joined sheets of dissimilar metals, is particularly directed to a method of forming sheets or strips consisting of two united and dissimilar metals into such forms as semi-cylindrical and other shapes without causing a separation of one metal from the other, and without causing any irregularity in the movement of the metal for the two sheets as they are formed which might produce eccentricity in the finished article.

To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims,

the annexed drawing and the following description setting forth in detail certain means and one mode of carrying out the invention, such disclosed means and mode illustrating, however, but one of the various ways in which the principle of the invention may be used. I

, In said annexed drawing Fig. 1 is a transverse vertical section showing that operation in my improved method which consists in forming a fiat sheet into semi-spherical form; Fig. 2 is a view in perspective of the die for producing the ridges or corrugations in the inner surface of the lining metal; Fig. 3 is a side elevation of'the die of Fig. 2; and Fig.4 is a transverse section through the finished article produced by my present method.

In cases where integrally unitedsheets of dissimilar metal-s. are formed into semi-cylindrical ,artlcles from flat stock the metal which is on the inside of the finished articles is of course present in an excess amount, since it does not require as much metal to form the innerportion of a circular bearing as the outerportion. Since the two sheets are integrally united together over their'entire surface there is bound to be a movement of the -metal of the inner sheet during the formation operation. This results either in a breaking loose of one sheet from the other or a decided flow of the metal of the inner sheet both circumferentially and longitudinally as it is being formed into a cylindrical or'semi-cylindrical article. During this flow of the metal it is extremely difficult to maintain concentricity between the outer surface of the outer sheet and the inner surface of the inner sheet and as soon as concentricity is maintained further accurate operations have to be per formed on the inner sheet, and also the inner sheet has to be trimmed at its ends where the metal has flowed out beyond the ends of the outer strip.

The present invention consists, briefly stated in forming a composite sheet consisting'of integrally united sheets of supporting metal and a softer bearing metal into -semicylindrical or other form between suitable dies, and at the same time providing'means for controlling and directing the flow of the softer lining metal to cause this flow to take place inward instead of longitudinally and circumferentially, as'is the case in the present method.

In Fig.1 I have shown a composite sheet consisting of a strip 1 of a suitable supporting metal, such as iron, steel or'the like, and

the strip 2 of lining metal, which may be of Babbitt or other suitable bearing metal, and which is of course softer than the supporting metal 1. This composite sheet, of which the two strips are integrally united over theiaentire surface, are placed between dies 3 and 4 for formation into a semi-cylindrical hearing. The die 4 is semi-cylindrical in outline but is provided with a series of longitudinally extending spaced parallel recesses which provide a place for the metal of the lining 2 to flow into as this metal is caused to flow during the pressing of the sheet from flat to semi-cylindrical form. The construction of the die 4 is shown in Figs. 1, 2 and 3 and the grooves 5 are so constructed that they provide a sufficient space for all of the excess metal of the inner sheet 2 so that there is sub- .stantiallyno circumferential or longitudinal flow of the lining metal during this step. The metal is thus caused to flow radially inward, producing a series of spaced parallel ribs 6, which project from the surface of the curved and formed article.

After the article has been thus formed the ribs may be removed down to the level of the intermediate bearing surface by machine, and as the metal is soft and readily worked this is a fast and economical operation. The chief advantages of my improved method is the eliminationof any trimming operation heretofore applied to the ends of the bearing to trim off the excess metal of the lining, the maintaining of true concentricity between the inner surface of the liner and the outer surface of the supporting strip, and the prevention of any rupture between the two sheets caused by the angular movement which is produced when forming a composite flat sheet into semi-cylindrical form.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the process herein disclosed, provided the step or steps stated by any of the following claims or the equivalent of such stated step or steps be employed.

I therefore particularly point out and distinctlv claim as my invention 1. In a method of making semi-cylindrical bearings from composite flat sheets of integrally united sheets of dissimilar metals, the steps which consist in forming said sheet into semi-cylindrical form while causing the excess metal of the inner sheet to flow radially inward, and then removing such excess metal to form a smooth inner surfaceconcentric with the outer surface of the 'outer sheet.

2. In a method of making semi-cylindrical bearings from composite fiat sheets of integrally united sheets of dissimilar metals, the steps which consist in forming said sheet into semi-cylindrical form and causing the excess metal of the inner sheet t6 .flow radially inward into inwardly extending ribs, and then removing such ribs to form a. smooth inner surface concentric with the outer surface of the outer sheet.

3. In a method of making semi-cylindricalbearings from composite flat sheets of integrally united sheets of dissimilar metals, the steps which consist informing said sheet into semi-cylindrical form between coopera tive semi-cylindrical dies, the inner one having spaced grooves therein to receive the excess metal of the inner strip, and then removing such excess metal to form a smooth inner surface concentric with the outer surface of the outer sheet.

Signed by me, this 25th day of January,

WILLIAM H: KLOCKE. 

